Grundy is a surname. Notable people with the surname include:
Felix Grundy (1777–1840), U.S. politicianEdward Grundy (1795–1875), politician and editor in South Australia.Sydney Grundy (1848–1914), English dramatistJoseph R. Grundy (1863–1961), American industrialist and politicianPatrick Michael Grundy (1917–1959; a.k.a. P. M. Grundy), mathematician known for the Sprague-Grundy theoremBill Grundy (1923–1993), British television presenter in the 1970sPaul Grundy (engineer) (1935–2013), Australian engineerReg Grundy (1923–2016), Australian television producerHugh Grundy (1945), English drummer (The Zombies)Stephan Grundy (1967), American author of saga retellingsRebecca Grundy (1990), English cricketer